Ignition-dynamo



S. C. McKEOWN.

IGNITION DYNAMO.

Pnlcmon mso ocr. ls. lsu.

Patented June 21, 1921.

i Tc. M M? WW m fication.

UNITED j xsy'iueiiazs sAiviUELc. Mex'EowN, oF EASTORANGE, NEW JERSEY,

AssIGNon. 'ro sPLiTnoRE ELECTRICAL COMPANY, OF NEWARK, NEWJJERSEY.

' IGNiTioN-EYNAMO.

Specification of Letters Patent. Patentd June 21, 192,1.

Application ined oetober 19,4917. serial 110.1191441.

To all whom at concern.: l i y Be it known that I, SAMUEL C. MoKEowN,

a'citizen of the United States, 'residing at East Orange, in the county vof Essex and State of New Jersey, have invented certain new and useful( Improvements in. Ignition- Dynamos, of which the following is a speci-y My invention relates vto ignition dynamos of the type shown "and described in Patent 1,126,676, issued January 26, 1915, toV

Charles T, Mason', in which the field magnets are arranged so that the plane of the magnets are `longitudinal with the driving shaft 'and the core pole pieces which carry theinductionv coil are arranged withinthe limbs ofthe magnets so that the elements or lobes of the rotor which serve to vary the flux through the induction coil are of'a con` stant magnetic polarity;- that is to say, eith'ernorth or south polarity. Y In this type of magneto it is the usual practice to'use two magnets with recesses cut out near the ends of the limbs of the magnets, which recesses make room for the rotor bearing supports and consequently in ordinary use the magnets can be readily removed by taking off the cover plates, no screws being used to hold them in position, the'same as in the Siemens armature type of magneto where the limbs of the magnets are screwed to the field pole pieces. y

In certain classesof work, however, where 1 the vibration `is excessive, such as on an 35 aeroplane engine, it has been found necessary to securely anchor or fasten the various parts of not only this type of magneto, but all other types so that they will not become loosened-and cause trouble. y l

It is the object of my invention to provide Vmeans for yfastening .the magnets securely in place inthe type of 4ignition dynamo above described. In order to carry out my invention it hasbeen necessary to change the constructionof many` of the partsV adaptedl for'ordinary commercial use and hence my invention isalso directed to improvements in details relating to the principal object set forth above.

attached specification and drawing wherein Figure 1 illustrates a side elevation of my ignitiondynaino with the outer .cover plate These and other objects will be apparent vf to one skilled inthe art after a study of the Y partially broken away, but showingall the other parts in operative position.

Fig. 2 is a plan view of the strap used for y holding the magnets in place.

In `the type of magnetoherein -referred to,

the timing lever is connected to the rotor housing structure so that the core pole pieces f and induction coil associated therewith are rotatable with the `breaker box by which construction the rotor always breaks at the same distance from the pole Hiecesfat 4all positions of the timing lever. j owever, lfor certain-*classes of work, such as on aeroplanes,'the engines run at substantially con;

stant speed and aV fixed spark ignition dyna-` mo is many times preferred, hence by way of illustration, since my invention is directed toffeatures employed in ignition dynamos used for aeroplane work, I have shown a fixed spark machine in which the rotor housing 1 carries the core pole pieces 2 between which pole pieces induction coil 3 having core 4i is held thereonby yokes 5.

The rotor housing 1 terminates in abase 6 Y to which is attached end plates7 and S by means of bolts 9 (only one of which is shown and whichrmay be of non-magnetic material, although I have found in practice that this is not absolutely necessary) and nuts 10.

The top portion ofthe plates 7- and 8 are heldin a permanently-fixed spacedrelationship by means of rods 11 (one only being insight), one end 12 of which is threaded andv is screwed into thelug 14 on the plate 8, until it strikesthe shoulder 13, which is preferablyl anintegral part of the rod 11. 'The opposite end ofthe rod 11 has a corresponding integral shoulder 111l against which the lug 15 kon the upper part of the plate 7 isidrawn bythe nut 16 which in'v turn is locked by nut 17. 1

' From the above described Vmethod -of holdiii-gv the end plates 7 and 8 in fixed relation-V ship to each other, it will be understood that the boxdike inclosure between plates 7 and 8 is available to receive the permanent magnets. In machining the rotor housing 1 for the circular bearing holders 18 'and 19, the

base 61s naturally cut out by the'tool and very little bottoni support is left forfthe magnets 20 except at the front and back sides ofthe base 6; hence to'furnish a support clear across the ends of the magnets 20,

I have provided kcross members 21 which are shown in the form of channel members. The front plate 8 carries the usual distributer block 22 and breaker box 23. On the inner portion of the top part of plate 8 (see Fig. 2) suitable bosses are provided to take a pin 24 which is securely fastened therein in any suitable manner, to which Va flexible strap 25 is secured as by rivets 26. The strap 25 is preferably made of sheet steel and is provided with lugs 27 preferably made by bending the sheet steel over a mandrel and riveting as shown in Fig. 2. Within the lugs 27 a bolt 28 is secured as by spot welding or rivets 29. The bolt 28 carries a threaded eye bolt 30 which is adapted to pass through the clamping boss 31 in plate 7 to the exterior of the dynamo where the clamping means may be readily operated. On drawing up the nut 32 the strap 25 is drawn tightly over the top of the magnets 2() which holds them securely in position.k A nut 33 is used to lock against nut 32 so as to prevent the strap 25 from coming loose. From the above description of the method of holding the magnets in place it will be seen that they may be readily removed by taking off the outer cover which will be hereinafter referred to and then taking off the nuts 33 and 32 and withdrawing the eyebolt 30 from plate 7 and turning back the fiexible strap 25, which allows the limbs of the magnets to be pulled outward away from the bearing holders and dropped down until the tops clear the rods 11, etc.

The end plate 8 has a shouldered portion 34 all around its inner periphery and plate 7l has a corresponding shouldered portion 35. These shouldered portions 34 and 35 act as guids for the outer cover 39 which passes around the magnets and has its opposite ends fastened to the base 6 by screws entering screwV holes 36. The cover is merely a flat piece of metal, preferably ribbed and non-magnetic. The shouldered portions 34 and 35 carry respectively grooves 37 and 38 for the reception of suitable packing, such as felt, for the purpose of making a water and dust proof joint when the cover is put in position.

While I have described the preferred form of my invention, it will be apparent to one skilled in this art that various details may be modified without departing from the spirit of my invention or the scope of the appended claims.l

Having thus described my invention what I claim is l. In an ignition dynamo of the type having the plane of its permanent magnets lonp gitudinal with the driving shaft whereby the core pole-pieces carrying an induction coil within the arch of the magnets are alternately connected to rotor limbs of constant magnetic polarity, the combination with said core pole pieces of a rotor housing constituting a support for the pole pieces and terminating in a base member, cross members carried by said base and supporting said magnets, end plates for said dynamo, bolts passing through said base for clamping the bottom of said plates securely to the base, rods for spacing and clamping in fixed position the tops of said plates and a holding strap for the magnets fixed to one plate and adj ustably secured to the other as and for the purpose described.

2. 1n an ignition dynamo of the type having the plane of its permanent magnets longitudinal with the driving shaft whereby the core pole pieces carrying an induction coil within the arch of themagnets are alternately connected to rotorlimbs of constant magnetic polarity, the combination with said core pole pieces of a rotor housing constituting a support for the pole pieces and terminating in a base member, cross members carried by said base and supporting said magnets, end plates for said dynamo, bolts passing through said base for clamping the bottom of said plates securely to the base, rods for spacing and clamping in fixed position the tops of said plates, a flexible strap having one end fastened to one plate and adapted to pass over the top Vof said magnets with means for adjustably fastening the other end to the other plate and a cover extending from one plate to the other and having its ends fastened to opposite sides of said base.

3. ln an ignition dynamo of the type having the plane of its permanent magnets longitudinal with the driving shaft whereby the core pole pieces carrying an induction coil within the arch of the magnets are alternately connected to rotor limbs of constant magnetic polarity, the combination with said core pole pieces of a rotor housing constituting a support for the pole pieces and terminating in a base member, a box like inclosure for the magnets consisting of said base and end plates having bolts passing therethrough, rods for securely clamping, at the same time spacing, the tops of said plates in operative position, a flexible strap fastened to one end plate and passing over the top of said magnets and adjustably fastened to the other end plate and a cover for closing in the sides and top of said box like inclosure.

4. In an ignition dynamo of the type having the plane of its permanent magnets longitudinal with the driving shaft whereby the core pole pieces carrying an induction coil within the arch of the magnets are alternately connected to rotor limbs of constant magnetic polarity, the combination with said base and end plates having bolts passing therethrough, rods for securely clamping, at the same time spacing, the tops of said plates in operative position, a flexible strap having means at one end for making a permanent fastening to one of said end plates and a threaded eyebolt attached to the other end, said eyebolt being adapted to pass through to the exterior of the other of said plates and having nuts screwed thereon to draw up and lock the position of said strap whereby said magnets are held securely in place and a cover for said box like inclosure.

5. In an ignition dynamo of the type having the plane of its permanent magnets longitudinal with the driving shaft whereby the core pole pieces carrying an induction coil within the arch of the magnets are alternately connected to rotor limbs of constant y magnetic polarity, the combination with said core pole pieces of a rotor housing constiy tuting a support for the pole pieces and terminating in a base member, cross members carried by said base and supporting said magnets, end platesfor said dynamo, bolts passing through said base for clamping the bottom of said platesfsecurely to the base, rods for spacing and clamping in fixed position the tops of said plates and a clamping means securely fastened to one plate and passing over the top of said magnets and having a part extending to the exterior of the other plate whereby the clamping means may be brought into operation from the exterior of the dynamo as described.

6. In an ignition dynamo of the type having the plane of its permanent magnets longitudinal with the driving shaft whereby' the core pole pieces carrying an induction coil within the arch of the magnets are alternately connected to rotor limbs of constant magnetic polarity, the combination with said core pole pieces of.a rotor housing consti- `tuting a support for the pole pieces and terminating in a base member, of back and front end plates having bolts passing therethrough and through said base to hold said end plates in permanent spaced relationship and rods at the top of said' plates, said front plate carrying a'breaker box, a distributer, and a flexible strap, supports on said base for the magnets, said strap having an end projecting through the back plate with magnetic polarity, the combination with said y core pole `pieces of a rotor housing constituting a support for the pole pieces and terminating in a base member, of back and front end plates having bolts passing therethrough and through said base to hold said end plates in permanent spaced relationship and rods at the top of said plates, said front plate carrying a breaker box, a distributer, and a flexible strap, supports on said base for the magnets, said strap having an end projecting through the back plate with means engaging said end to kdraw said strap tightly over the top of said magnets to hold them securely in place on their supports, said front and back plates being shouldered around their inner faces, grooves adapted to take packing in said shouldered portions and a cover adapted to fit between said plates against said shouldered portions and said packing to form a water and dirt proof joint. l

In witness whereof I aliix my signature. 

